US2292566A

US2292566A - Electric motor

Info

Publication number: US2292566A
Application number: US384148A
Authority: US
Inventors: Richard H Jordan
Original assignee: AC Gilbert Co
Current assignee: AC Gilbert Co
Priority date: 1941-03-19
Filing date: 1941-03-19
Publication date: 1942-08-11
Anticipated expiration: 1959-08-11

Description

Aug .11, 1942. R, J RDAN 2,292,566 I ELECTRIC MOTOR Filed March 19, I941 6 Sheets- Sheet l Aug. 11, 1942.

R. H. JORDAN ELECTRIC MOTOR Filed March 19, 1941 6 Sheets-Sheet 2 R. H. JORDAN ELECTRIC MOTOR Aug. 11, 1942.

Filed March 19, 1941 6 Sheets-Sheet 3 ffiuuwa 14 w m w -ja-nim/ a My ammo/1 16* Aug. 11, 1942. R. H. JORDAN ELECTRIC MOTOR Filed March 19, 1941 6 Sheets-Sheet 4 A 11, 1942- R. H. JORDAN 92, 6

ELECTRIC MOTOR I Filed March 19, 1941 6 Sheets-Sheet 5 -11,1942. R. H.JQRDAN 2,292,566

ELECTR IC MOTOR Filed March 19, 1941 6 Sheets-Sheet 6 Patented Aug. 11, 1942 UNITED STATES PATENT. OFFICE,

ELECTRIC MOTOR Richard H. Jordan, Hamden, Conn, assignor to The A. 0. Gilbert Company, New Haven, Conn., a corporation of Maryland Application March 19, 1941, Serial No. 384,148

12 Claims. (01. 17236) This invention relates to electric motors of the general type described in my Patent No. 2,247,708, dated July 1, 1941, where the motor is used in connection with a kitchen utility device or mixer and adapted to drive agitators or beaters, a fruit reamer, and a power shaft to which various accessory appliances can be connected.

One 'of the objects of my present invention is to provide an improved and simplified device of this character which can be manufactured at relatively low cost.

Another object is to provide an improved and simplified arrangement of power. shaft and driving gearing therefor.

Another purpose is to improve the provisions for controlling the speed of the motor so that the speed can be nicely adapted to the particular operation which is being undertaken, for example, mashing potatoes, or extracting orange juice, or chopping meat, or the like.

Another object is to provide for a device of this character a speed-governing mechanism which is to a large degree of unitary character, occupying a separate casing part and adapted for very convenient assemblage with the other parts of the device, doing away with tedious operations of wiring which have heretofore made .Fig. 21 being a section on line 2|2l of Fig..

the assemblage of such devices a difficult and time-consuming'operation.

To these and other ends the invention consists in the novel features and combinations of In the accompanying drawings: Fig, 1 is a side elevation of an electric motor embodying my improvements, the supporting parts to be hereinafter described and claimed.

pedestal being partially shown; 7

Figs. 2, 3 and 4 are, respectively, a top plan view; a rear view, and a front view:

Fig. 5 is an enlarged-section on line 5-5 of Fig. 6 is a section on line 66 of Fig. 5; V Fig. 7' is a section on line of Fig. 5, the handle being shown in dotted lines;

Fig. 8 is a section on line 8-8 of Fig. 7;

a juice reamer above the casing, and a hori- .Fig. 9 is a bottom plan view of, the upper half r of the gear case, the vertical shaft and its associated bearing being omitted;

Fig.. 10 is a plan view-of the lower half of the'gear case, with all of the gearing removed;

Fig. 11 is an elevational detail view of the intermediate or m in portion of the casing looking toward the rear end of said portion;

Fig. 12 is a detail section on line l2.-l2 of Fig. 11,"

Fig. 13 is a detail elevational view of the governor case and its contained parts, looking togovernor case of Fig. 13, showing the speed-controlling device in the oiff position;

Fig. 17 shows certain parts illustrated in Fig.

16, showing one of the, positions assumedby the diaphragm when the motor is in operation;

Fig. 17 is a detail perspective viewillustrating in part the means by which the diaphgram is tiltably mounted with respect to the orifice controlled thereby;

Fig. 18 is a section on line |8-l8 of Fig. v16;

Figs. 19, 20 and 21 are details of the speedcontrolling cam, Fig. 19 being a view looking from the front, Fig. 20 being an edge view, and

10; and Fig. 22 is a diagram showing the electrical connections.

In its general features the improved electric motor is similar to that described in Patent No. 2,247,708, involving a combined motor and 'gear casing having an electric motor'in the rear and gearing in the front, the electric motor having a horizontal forwardly extending shaft, and the gearing comprising horizontal gears located later'ally of and driven from the motor shaft, there being an assembly mounted within the front portion of the casing comprising a vertical shaft connected to and driven by and from one of said gears, and having .a depending portion adapted to drive a tool such as an agitator 0rbeater below "the casing, and an upwardly ex tending portion adapted to drive a tool such as zontal shaft termed a power shaft geared to and driven from that portion of the vertical shaft located above themotor shaft, the casing having a socket in its front portion into which a tool or accessory can be introduced for coupling to the power shaft. However, in this new construction the speed-controlling mechanism, instead of being disposed for the most part in the front portion of the casing, is contained in' a separate casing portion at the rear of the motor, and forms with said casing portion a selfcontained unit, as hereinafter more particularly pointed out. As in the patent referred to, the motor is adapted to be removably supported on within the casing section A the upper end of a suitable pedestal. and for lifting purposes is provided with a handle, but

in the present instance the handle has a somewhat different form and arrangement, and there is a different arrangement of the power shaft.

In the drawings the casing of the motor member in its entirety is indicated at A, and comprises a front portion A containing the gearing, a main portion A containing the motor proper, and a relatively small rear portion A containing the speed-controlling mechanism. These portions of the casing are all separately constructed and are adapted to be interconnected in the manner hereinafter described. The electric motor is indicated generally at B, the front gearing at C, the speedcontrolllng mechanism at D. e motor shaft is shown at E, the vertical shaft in the front portion of the casing at F, the power shaft at G, and the so-called power socket in the front portion of the casing at H. The handle for the motor member is shown at I, and it will be noted that this handle is connected at one end to the casing portion A and at the other end to the casing portion A A portion of the supportingpedestal of the motor member is shown at J and at K is indicated a part of the electric cable structure leading into the motor through the lower rear part of the casing.

Referring now to the details, I will takeup first the main portion or section A of the casing and the parts therein contained. The casing portion is preferably a die casting having a spider 25 at the rear in whichthe motor shaft E has a bearing 26. On the motor shaft is an armature 21 rotating within the field core 28 having the usual field winding 29, 'these latter parts'being held in the casing in the usual or any preferred manner. In front of the armature the motor shaft has a bearing 30 in a removable partition 3| secured in a seat 32 adJacent the front end of the casing section. The partition 3| may be held in place by means such as screws 33. Between-the partition 3| and the armature, the motor shaft carries a ventilating fan or impeller 34. This fan is adapted to suck air from suitable air openings such as the slot-like openings 35 at the lower rear portion'of the casing section, and the air passed on by the fan is thrown radially outwardly so as to leave the casing section by way of air exit openings 38. These air exit openings 36 may be conveniently formed as notches in the forward edge of the casing section at the lower part of the section, the forward ends of the notches being closed' by the partition 3] At its lowerrear portion the casing section A has an integral projection 31 by means of which the motor member may be conveniently mounted in a removable manner upon the upper end portion of the pedestal J but this mounting means forms no part of the present invention.

At its rear end the motor shaft E is extended past the spider 2i, and at its extremity carries a the thrust bearing 38 is provided so as to transfer the forward thrust on the shaft to the rear bearing support.

The cable K enters the casing through a groove or recess 42 formed partly in the lug 11.

The motor has the usual or any preferred brushes 0, the action of which is controlled by adjustable screw caps ll of insulating material occupying sockets l5 formed in the sides of casing section A. Fig. 6 shows the field core 28 as held in place against an abutment 48 in the rear part of section A by means of screws 41.

The worm ll on the forward end of the motor shaft extends forwardly into section A, and there cooperates with the gearing in that section. The

casing portion containing the gearing is divided in a horizontal plane so as to provide upper and lower parts. the lower part being indicated at 48 and the upper part at 49. The joint between these parts is shown at 50 in Fig. 5, and is preferably in the same horizontal plane as the motor axis.

The worm H at the end of the motor shaft engages and drives a relatively deep worm gear 5| positioned to one side of the motor shaft in' the manner shown in Fig. 6, and this deep gear 5| engages and drives a shallow worm gear'l! whose axis in this particular case is in line with the motor shaft, as shown in Fig. 6. The shallow gear 52 drives the vertical shaft F previously referred to, and the latter shaft drives the power shaft G. The vertical shaft 1! is preferably formed as a tube, the lower end of which is accessible in a socket 53 at the lower part of easing member 48 to receive and drive the shank N of a suitable tool such as a beater. The upper end of the vertical shaft extends upwardLv out of easing part 49, and is adapted to receive and drive the shank iii of a suitable tool such as an orange reamer. Thelower part ofthe tubular vertical shaft is adapted to rotate in a sleeve portion 56 projecting upwardly in part 48, and preferably formed integrally therewith. Above this sleeve and supported for rotation thereon is a member S1 to which the shallow pinion if is suitably secured. and member 81 is connected to the hollow shaft F by suitable means, for example, a pin 58, the arrangement being such that rotation imparted to gear 52 is transmitted in an effective manner to member 51 and to shaft F. Member 51 at its upper portion is cut or otherwise provided with}; worm "meshing with a gear 80 on shaft G in order to drive said shaft.

The gear 5|, as wellas gear 52, is adapted to drive a tool shaft depending from the casing, and for this purpose gear II is secured at the upper end of a hollow shaft 8| mounted in a sleeve if similar to sleeve 58, this sleeve being open at fan or impeller 38 which is preferably mounted the bottom in order that the shank ll of a beater or like tool may be introduced and locked to hollow shaft 6| so as to be driven directly by gear 8| as the latter rotates.

In the preferred arrangement the worm on the motor shaft engages the upper part of the deep gear II in such a manner that this gear is driven, while the lower part of the gear directly meshes with the narrow gear I! in order that the vertical shaft may be driven in a very direct and effective manner.

The format the upper part it is shown in Fig. 5. and also in Figs. 7 to 9; inclusive. At its upper part it is provided with an integral upwardly extending sleeve or bearing portion 88 adapted to act as a bearing portion for the upper end portion of the tubular shaft 1'', and this sleeve 65 which takes the upward thrust on the vertical shaft F when the power shaft G is being operated. In Fig. 9 this thrust bearing 65 is omitted, but a socket 66 in which the sameis adapted to be retained is shown. Figs. 7 and 8 show an integral cast bearing-supporting structure 61 at the upper part of the casing against which the power shaft G is mounted, the bearing of said shaft bein retained from beneath by a cap member '68 fastened to the other bearing-supporting member by screws 69 adjacent one end of the shaft and screws 10 adjacent the other end thereof, as shown in Fig. 9. The

parts

48 and 49 of the front section of the casing are secured to each other by three screws 1 I, which are screwed through part 48 from beneath and engage threaded sockets 12 in the structure of the transverse bearing provided for the power shaft G.

Around theupwardly extending sleeve 63 the upper part of the casing is cut away to provide a recess 13 receiving the front end of the handle tened to the main section A by suitable means such'as screws 14 disposed with their heads in the rear portion of recss 13, as shown in Figs. 7 and 8. At the lower part of easing section A the sameis fastened to section A by screws I5 having their forward headed ends disposed and concealed in recesses 16 in the forward curved surface of the casing.

The worm gear 60, previously mentioned, by which the power shaft is driven, is attached to the intermediate portion of said shaft by means such as a pin 11. It will be seen from Fig. 7 that the bearing proper of the power shaft is constituted by a sleeve-like bearing member l8 surrounding said shaft and having a rib l9 entering a groove 99 in portion 6?, previously men tioned, in order to hold the bearing member from longitudinal movement. At the right-hand end of the power shaft (Fig. 7) the same has an enlarged portion 8| rotating in an opening formed between

parts

67 and 68. The extremity of this enlarged part of the power shaft is provided with a notch 82 so that it may be drivingly engaged with the tenoned shaft of an accessory appliance introduced partially into the power socket H. At the other extremity of the power shaft the same The upper end of the sleeve 63 preferably termi- 1 I, 'and the front section A of the casing is fa'sis reduced in diameter, as shown at 83, and has a collar 84 attached thereto by a set screw 85 so as to prevent dislocation of the shaft member in a direction toward the right of Fig. '7.

Rising from the upper casing portion 49 behind the sleeve 63 within the handle-receiving recess 13 is a small interiorly threaded screw socket 86, shown in Fig. 5, and this socket is adapted to receive the lower threaded end of a screw 8'? by means of which the handle I is attached to the casing. This screw passes through a hole in the downwardly curved front end portion of the handle, and the upper end 88 of the screw is received and partially concealed in recess 89 in the handle. This recess 89 is located behind a larger hole 90 through the handle, providing clearance for the tool'shaft previously mentioned, which may be the shaft of an orange juicer. The hole 90 enables the front end portion of the handle to be inserted downwardly into the handle-receiving and positioning recess 13, with the handle surrounding the sleeve 63, previously mentioned.

nates, as shown, short of the upper end of hole 90, so that the upper end of shaft F and its associated bearing are for themost part concealed from view.

The handle I is preferably made of suitable plastic composition molded to the required shape.

Its rear end is attached to the casing section A by means such as a screw 9| engaging an interiorly threaded sleeve 92 formed on casing section A at its upper part. The upper end of screw 9| is received and concealed in a recess 93 in the handle.

The casing section A which I refer to as the governor casing, is of somewhat reduced diameter as compared to the main casing section A. and is applied to the rear of the latter, and has its external wall curved or rounded so that, with the other two sections, a casing of ovoid shape is created somewhat narrower at the rear than at the front- The section A is generally of cup shape, and it may be advantageously formed as a. die casting having socket portions 94 at the sides receiving screws 95 used for attaching this section removably to section A the heads 96 of screws 95 being partially concealed in recesses 9V in the wall of section A These screw 95 engage threaded sockets 98 in certain arms of the spider 25 which is at the rearend of section A, and, as will be seen from Fig. 6, these arms of the spider form rear abutments or supports for the brushes of the motor. Set screws 99 for holding in place insulating sleeves I00 disposed about the brushes are accessible from the rearface of the spider byway of sockets lllli when the governor casing is removed. This structure is best seen in Fig. 6.

The fan or impeller 39 previously referred to is so arranged as to be within the front portion of section A within a chamber 092 in said section, this chamber being at the front of a partition i033 which extends transversely across the space within section A This partition in the preferred form shown is of insulating material and is removably held in place by screws M4 against lugs 695, i 96 and GM formed on the wall of the governor casing. These lugs are shown in Fig. 18, and from this view it will be seen that behind these lugs the governor casing is of spider-like formation having, in this particular case, upright arms W8 and lateral arms 1109, creating between them open ventilating spaces H9 having the function hereinafter pointed out. At their inner parts the arms I 98, E09 are joined to a central disk-like support iii in which is mounted a cam H2 disposed interiorly of the casing and provided at the rear of the casing with an operating thumb-piece or head M3. Moving with the thumb-piece or head is a thin dished cover member H4 extending over and for the most part covering the spider portion of the casing, although permitting air to manner hereinafter pointed out.

The cam H2 is made of insulating material,

and the thumb-piece H3 is also preferably made of insulating material. It will be seen from Fig. 16 that at its inner surface the thumb-piece is curved so as to conform to the surface of the cover piece H4. A squared portion H5 projects forwardly from the middle portion of the thumbpiece and is received in a' correspondingly shaped hole H6 in the cover piece, and also in a correspondingly shaped shallow socket H1 in the cam. A screw H8 having a head H9 at the forward face of the cam passes through a hole I20 in the cam and into a threaded socket III in the thumb-piece, so that the thumb-piece, coverpiece and cam will be fastened together in the relation above described. Thus the thumb-piece when turned on its axis will turn the cover-piece and the cam. is shown in Fig. 10, the cam has a rear bearing asrtion II2 engaging a bearing hole formed in the disk-like portion III.

The partition I03, previously referred to, is provided at its central part with an air port or passage, and preferably this is constituted by a a round aperture I22 in the partition. Cooperating with this aperture is an air valve or diaphragm I23 which may. advantageously be formed as a thin sheet metal plate of ribbed construction. This plate is generally of disk shape and of somewhat greater diameter than aperture I22, and is disposed in front of the partition so that the peripheral portion I23 of the diaphragm may seat against the front face of the partition in the manner shown in Fig. 16, in order to prevent air from passing through aperture I22 in a forward direction from the open rear portion of the governor casing.

The diaphragm is movably mounted with respect to aperture I22, and preferably the mounting is as illustrated, the diaphragm being provided with arearwardly projecting hub I23 to the rear end of which is attached, as by a screw I23, a swinging contact lever I21 having a pivoting lower portion and a freely swinging upper portion. The upper portion carries an electrical contact I23 operating in the manner hereinafter described. The manner of pivoting thelever I21 at its lower portion is preferably as illustrated in the drawings, a portion at the lower part of the lever being connected bysmall rivets I23 to a thin metal plate I30 disposed adiacent the front face of the lever portion. The lower'part of plate I30 is disposed rearwardly of and against a pivoting or knife-edge portion I3I projecting rearwardly from the partition I03, the arrangement being such that lever I-21 will pivot on the knife edge to swing the contact I23 in a forward and rearward direction. The plate I33 is of thin sheet metal, and is formed at the middle portion of a strip I32 integral therewith. The ends of the strip are fixed against bosses I33 on the partition by pins or rivets I33, but the middle portion of the strip is free to twist so that the lever can have the necessary pivoting movement against the knife edge I3I,

The lower part of lever I21 immediately beneath the cross strip I32 is bent upwardly and forwardly to provide a portion I33 extending through an opening I33 in the partition, and the front end of this portion I33 is bent downward,

as indicated at I31, to enter a small helical spring I33 mounted in a socket I33 adjacent the lower edge of the partition. A set screw I33,-accessible in an opening I3I at the lower part of the governor case, regulates the action of the spring I33, which action is to force the extremity of the lever in an'upward direction. By being forced in an upward direction at its lower part, the lever is caused to be urged in a rearward direction at that part which is connected to the diaphragm, and therefore the tendency of the spring is to hold the diaphragm in the closed position shown in l6. Mounted behind the swinging contact lever I21 is a cooperating member I32 having a contact I33 adapted to be engaged by contact I23, as the latter is moved rearwardly. Preferably the member I32 is constituted by a resilient metal strip secured by a pin 0. rivet m (m. is) against the I and intermediate of its ends it is provided with a rearwardly projecting pin I33 adapted to be engaged by the cam H2 in the manner hereinafter pointed out. As will be seen in Fig. 15. the post I33 is disposed somewhat to one side of lever I21, and at the opposite side of said lever is disposed a supporting post I31, to which is fastened by means such as screw I33 a swinging contact member I33. This contact member I33 is preferably formed as a sheet metal strip, the lower end portion of which is fixed in position against post I31, while the rear extremity is adapted to move toward and from a fixed contact member I30, preferably formed by an angularmember secured by rivet I3I to the rear face of the partition. Intermediate of its ends strip or lever I33 is provided with a projecting portion or bend I32 adapted to be engaged by the cam H2 in the manner hereinafter described, and the arrangement is such that the motor will be in the running position only when the upper extremity of lever I33 is engaged with contact member I30.

In order to facilitate the making of the proper electrical connections between the motor circuit and the governor circuit. I have devised a construction in which the principal parts of the governor mechanism are mounted in a separate casing attachable to and detachable from the main portion of the casing, and I have provided an electrical connection of such nature that when the governor casing with its contained parts is phced against the main part of the device, for aaiemblage therewith, the two legs of an electrical circuit, including the motor and the governor (with or without other elements). will be automatically closed and established so that no further wiring will be required. Obviously this assists greatly in the assemblage and production of a motor structure of this kind, as it is merely necessary to plug together the main and supplemental casings in order to establish the electrical connections. In the preferred construction the governor mechanism to be applied to the main casing has forwardly projecting prongs, which, when the assemblage is made, are automatically moved into cooperative engagement with cooperative contact members carried by the main section of the device adjacent the ,rear end thereof. Preferably. the prongs are carried by and project forwardly from the partition member I03, and preferably these prongs cooperate with contact members in the form of spring leaves carried in the-rear end portion of casing section A, but while this construction is preferred, many variations will suggest themselves to those skilled in the art. In the present case I have illustrated prong members I33, I33 projecting forwardly from partition I03 in locations adjacent the lower edge of said partition. ,Prong I33 in the assembled position establishes contact with a fixed contact leaf I35, and prong I33 establishes contact with a fixed contact leaf I33. These leaves I33 and I33 are mounted on an insulating supporting plate I51 attached preferably to the spider 23 at the lower part thereof in the manner shown in Fig. 11. These contact leaves are disposed forwardly of the insulating plate, and are supported thereby in a suitable manner, as shown. for example, in Fig. 12, and it will be noted that the insulating plate has slots I30 to receive the prongs as the latter are thrust forward. As the prongs are thrust through the portion connectedby a pin I62 to a short conducting strip I63 at the front face of the partition, and this strip, by means of a pin I64, is connected to the pin I44, previously mentioned, which pin I44 is electrically connected with the spring-arm 142. The cross strip I32, previously mentioned, which forms a part of the mounting means for lever I 21, also constitutes a part of the electrical circuit because atits left-hand end (Fig. this strip is connected by a small connecting strip I65 with the screw I46 and contact arm I49. In order to have the motor operate with the connections as shown, it is necessary to have contact established between contact member I50 and arm I49, and it is also necessary to have contact established between contact members I28 and I43. The making and breaking of the circuit at these two points is controlled by the cam member II2, the forward portion of which is formed to cooperate with and move the Contact am I42 and also the contact arm HQ.

For the purpose ofcontrolling the position of arm I42, which is provided with the 'rearwardly projecting pin I46, the forward face of cam I I2 is provided with a groove I66 in which the pin I46 rides, and this groove I66 is so arranged that, as the thumb-piece H3 is rotated in one direction, contact I43 is swung forwardly, whereas when the thumb-piece is moved in the other direction, said contact will be permitted by its spring action to move rearwardly.

Contact arm I 49 has generally speaking a radially inward and outward swinging movement with respect to the motor axis, and in order to control this movement the bent or projecting portion I52 of said arm is arranged to bear surface of the cam above the bent part I62 will immediately com into contact with said bent part and force arm I49 into contactwith contact member I50, and this contact is maintained throughout the remainder of the operative movement of the cam so that the circuit will be maintained, and the circuit will be maintained until the cam is moved back to the inoperative or off position, at which time bent portion I52 will be permitted to move back into its notch, and the circuit will be interrupted no matter what posi tion may be assumed at that tim by arm I42.

In order to limit th rotational movement-oi the angularly shiftable speed-controlling memher, I prefer to provide stop'means between the. cam member H2 and the spider provided at the rear portion of the governor casing. In the form shown, the spider portion is provided with a foragainst the side of the cam- H2, and to cooperate with a cut-away portion or notch I6 formed in the side of the cam.- When the projection I52 lies in this notch, as shown in Fig. 18, arm M9 is out of contact with contact member I50, and the circuit is broken at this point. This is the off position of the speed-controlling device or switch, in which position contact members I 43 and I28 are out of contact with each other, as shown in Fig. 16, and thus in this off position the circuit is broken in two places, which is a very desirable feature for safety purposes.

' When the cam is in the .o position shown in Figs. 16 and 18, the pin or projection I46 lies in a depressed portion I66 of the cam, best shown in Fig. 18. Upon rotation of the cam in a counter-clockwise direction with respect to Fig. 18, projection I46 is engaged by a sharp shoulder I66, which gives arm I42 a definite forward thrust so that rather quickly it makes contact with contact member I 28 if the latter is in the position shown in Fig. 16. Thereafter the slope or groove I66 is more gradual until the end of the groove is reached, at which end a sharp stop 56 is provided, which will block further turning of the cam.

Upon rotation of the cam from the position of wardly projecting stop lug I68, best shown in Fig. 18, and the side surface of the cam is adja-- cent this lug and carries stop shoulders I69 and H0, respectively, which. abut the lug in order to stop the cam at the respective limits of its turning movement, the turning movement in the particular case illustrated being approximately 180.

In order to prevent the turning speed-adjusting member, after being adjusted, from being shaken or jarred out of the. adjusted position, suitable means should be provided, and in the case illustrated the forward face of th cover member H4 is provided with a knurled portion III of arcuate shape against which presses a small ball I12 (Fig. 6) urged rearwardly b'y'a helical spring I13 located in a socket casing,

The cover member I! is preferably provided on its rear face with a speed scale, as shown in Figs. 3 and 14. Th indications on this scale, which run for a distance along the periphery of the cover member, are intended to cooperate with a fixed pointer, such as indicated at I15, provided on the governor casing. There may also be on the governor casing indicating means coordinated with the dififerent speed numbers on the cover member, as shown in Fig. It, so a to show which speed is used for the operation known-as I74 provided in the governor cut-fold, which speed is used for stirring, and

. ternal surface ofthe casing.

For the purpose of controlling the speed of the motor, air enters the governor casing at the rear portion thereof, and in this particular instance passes over the periphery of the cover member II4 in the manner indicated by the arrows in Fig. 17, so as to pass into the governor casing through the spider portion. For this purpose the forward edge of the cover member is slightly spaced in a rearward direction from the adjacent surface of the governor casing.

As the above appears, the circuit of the motor is open at two points where the speed-controlling member is "in the off position. When the speed-controlling member is slightly turned so as to bring it into the position of speed No; 1, the circuit will have been closed at the two points Fig. 18 in a counter-clockwise direction, the side in the manner P eviously indicated, the contact The indicating means on in one arm I42 having been moved to a position where it makes light contact with the lever I21. This light contact will be sufficient to shift the diaphragm I23 slightly so as to open the aperture I22 to a slight degree for the passage of air in a forward direction, this air being sucked forwardly as the motor starts and the fan 38 begins to revolve. Air sucked forwardly out of the governor casing by fan 38 passes forwardly to the motor to ventilate the same, along with air sucked into the motor through the slots 35 by means of the regular ventilating fan 34.

As the motor operates in performing the particular operation being carried on, there is a tendency for the motor to speed up as the load is decreased, and as the motor speeds up under such conditions, the fan 38, being more rapdily revolved, exerts a greater suction action upon the diaphragm, causing it to be moved forwardly, and this causes the lever I21 to be tilted in such a manner as to break contact with arm I42. The motor then slows down until lever I21 moves backwardly again to make contact with arm I42 and restore the circuit. This action takes place in substantially the same manner with the speedcontrolling member in any one of its different adjustments, but it will be understood that, as the speed controlling member is progressively advanced toward the higher speed positions, arm I42 will be shifted forwardly more and more. The result of this will be to require a greater shifting movement of lever I21 before the circuit will be broken, and therefore the motor will be permitted to build. up to a higher and higher speed. Where, for example, the accessory appliances or attachments are used which are associated with and driven from the power shaft and require considerable power for operation, the motor is rotated at the maximum speed for which it is designed, and there will be little if any circuit-interrupting action of the governor.

The arrangement of gearing, as herein described, for driving the verticaltool shaft and the horizontal power shaft is very simple, compact and efficient, requiring a minimum number of parts for the intended purposes. Only two main casing parts for the gear casing section are required, the power shaft being arranged and mounted in the upper part and extending transversely thereof in a space which is effectively utilized. The handle construction of the motor member is also simple. strong and effective. The interior parts are easily accessible for repairs or replacements, if after long use these become necessary.

It will be noted that the electric cable for supplying power passes directly into the main or motor section of the casing, where, in the process of manufacture, the connections to the motor and back to the fixed contact members I55 and I56 through the circuit leads I11 and I18 (note Fig. 22) can be made in a convenient manner. In this connection it is interesting to note that, while the main casing section is preferably made casting, 'and extends continuously throughout the periphery of the motor member.

this section is open at both ends, which makes the interior more accessible than it would be otherwise. Obviously one of the last steps incident to the production of the motor section will be the placing in position of the separate partition or wall 3| at its forward end.

The manufacture of the governor section and its contained parts can be separately conducted. After the governor section has been completed,

its mere assemblage with and upon the motor section in the manner previously described will cause the motor circuit to be completed. In this particular case two gaps in the motor circuit are closed by the prong members carried by the governor section, but I have in mind that under certain conditions only one such gap might be closed by the assemblage of the two sections of the device. It is also manifest that so far as the governor section is concerned, in the particular form described, it embodies no wiring, the major part of the electrical connections being provided by strip members on the .insulating partition. The parts carried by the partition may be conveniently applied thereto before the partition is secured in place in the governor casing.

While I have shown herein but one form of electric motor embodying my improvements, this being the preferred construction, it is to be understood that my invention is susceptible of many different embodiments, and that various changes in the organization of parts and in the details can be made without departure from the principles of my invention or the scope of the claims.

What I claim is:

1. In an electric motor structure, a combined motorand gear casing having an electric motor in the rear and gearing in the front, said electric motor having a horizontal forwardly extending shaft, and said gearing comprising a horizontal gear located adjacent and driven from the motor shaft, a vertical shaft in the front portion of the casing driven from said gear and having associated therewith at the upper part of the casing a connection for an external tool, and a horizontal shaft disposed behind said vertical shaft and disposed transversely in the upper part of the gear casing and intergeared with and driven from that portion of said vertical shaft above the motor shaft, said casing having a socket at one side thereof into which a tool can be introduced for coupling to said horizontal shaft.

2. In an electric motor structure, a combined motor and gear casing having an electric motor in the rear and gearing in the front, said electric motor having a horizontal forwardly extending shaft, and said gearing comprising a horizontal gear located to one side of and driven from the motor shaftand another gear driven by the first gear and located substantially in line with the motor shaft, a vertical shaft in the front portion of the casing concentric with and driven from said last-namedgear and having associated therewith at the upper part of the casing a connection for an external tool, and a horizontal shaft disposed transversely in the gear casing and intergeared with'and driven from that portion of said vertical shaft above the motor shaft, said casing having a socket in its side into which a tool can be introduced for coupling to said horizontal shaft.

3. In an electric motor structure, a combined motor and gear casing having an electric motor in the rear and gearing in the front, said electric motor having a horizontal forwardly extending shaft,-and said gearing comprising a deep gear located to one side of and directly driven from the motor shaft, and a shallow gear driven from the'first gear in a region offset from the horizontal plane of the motor shaft, said lastnamed gear being substantially in line with the motor shaft, a vertical shaft in the front portion of the casing concentric with and driven from said last-named gear and having associated therewith at the upper part of the casing a connection for. an external tool and having associated therewith-at the lower part of the casing.

4. In an electric motor structure, a combined motor and gear casing having an electric motor in the rear and gearing in the front, said electric motor having a horizontal forwardly extending shaft, and said gearing including a horizontal gear located laterally 'of and driven from the motor shaft, and an assembly mounted within the front portion of the casing comprising a vertical shaft of tubular form connected to and driven by and from said gear and having a depending portion adapted to'drive a tool below the casing and an upwardly extending portion adapted to drive a tool above the casing, and a horizontal shaft geared to and driven from a portion of the vertical shaft and disposed transversely to the motor shaft, said casing having a socket in its side into which a tool can be introduced for coupling to the horizontal shaft.

5.111 electricmotor such as set forth in claim I 4, in which the part of the casing containing the gearing is separated into two parts, the transverse horizontal shaft being carried by the upper upper section of the gear casing and at the opposite end to the governor casing.

' 9. In an electric motor structure, a combined motor and gear casing having an electric motor in the rear and gearing in the front, said electric motor having a horizontal forwardly extending shaft and said gearing comprising a horisontal gear located adjacent and driven from the motor shaft, a vertical shaft in the front portion of the casing driven from saidgear and having associated therewith at the upper part of the casing an open socket for the connection of an external tool, a horizontal shaft disposed 'behindsaidverticalshaftandtransverselyof the gear casing and driven from that portion of the vertical shaft above the motor shaft and adapted to be coupled to any of a number of accessory appliances to drive the same, and a handle connected to said casing at the upper part thereof and having a front end portion with an opening therethrough for the insertion of the' upper external tool into connection with said sontal gear located adjacent and driven from in the rear and gearing in the front, said' elecshaft above the motor shaft and adapted to act sgapowershaftforthedrive ofvarlousaccessory appliances, said casing in the portion enclosing the motor being circumferentially continuous and having a removable partition at the A front,and the portion enclosing the gearing being divided into upper and lower parts.

7. In an electric motor structure, a combined motor and gear casing having an electric motor in the remand gearing in the front, said gearing adapted to drive upper and lower tool shafts and horiaontal power shaft, said power shaft so being located within the casingythst part of the motor-casing enclosing the power shaft being divided along a horisontsl plane into upper and lower parts, that part of the casing enclosing .the motor being circumferentially continuous and having open'front andrear ends, a removable partition front end, and a removable governor casing' closingthe rear end.

8. Anelectricmotorsuchassetforthinelaim 7 having a handle attached at one endto the the motor shaft, a vertical shaft in the fro P rtion of, the casing driven from said gear and associated therewith at the upper part having of-the casing a socket through which an external tool can be introduoed,.said socket being formed on the upper part of the casing, a handle whose front end portion has an opening in which said socket is disposed, means for securing said handletotheup'perpartof the casing,anda tal shaft dispbsed behind said vertical shaftandtransverselyof thecasingbelowthe of said handle and intergeared with ven from saidivertical shaft and having socket associated therewith at the side of the an electric motor structure, a combined casing having an electric motor gearing in the front, said elecand said searing comprising a horizontal getaorriocated'to one side of and driven an located substantially in line th-the-motor shaft adjacent the free end of concentric with i driven from lss't-nsmedgearandadaptedtodrivean tool. a handle for carrying ving a forward end atverticaishaft. 1

, motor structure such as set orthinclsimi inwhichtheupper'partofthe oasingcarriesanupwardlyprojectingsleeveporsm'roundingsaidverticalshaftandlocsted conoealedintheopeningthroughthehandle.

arcnann 3. tonnes.

shaft and another gear driven by vertical shaft in the front-portion casing. said for-